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[ZEPPELIN-5937] Upgrade elasticsearch version
What is this PR for? Bump elasticsearch version for fixing CVE-2019-7611
What type of PR is it? Improvement
What is the Jira issue? https://issues.apache.org/jira/browse/ZEPPELIN-5937
Obviously, upgrading Elasticsearch from 2.x to 7.10.x(it's the latest version released under Apache License V2, or later) is not a simple version bumping, I suppose this module lacks of maintenance too, and should be considered for removal.